Virgin Media Vivid 100 BQM - please interpret!

I'm a Virgin Media customer with VIVID 100 Optical Fibre via Super Hub VMDG480 as modem/router. For the past few months our connection has been slow, intermittent or non-existent with my stepsons experiencing severe lag on PS4 (to the point that games become unplayable). Virgin have confirmed that there are known issues in our postal area and claim to have resolved them but the problem remains. I'd be really grateful if anyone here could shed some light on my BQM graph, created yesterday: